Apparatus for spraying of colors and the like



July 6, 1937. GELLN ER ET AL 2,086,183

I APPARATUS FOR SPRAYING OF COLORS AND THELIKE Filed Feb. 14. 1935 Jnven/ors Ll/OWIG GELLNER m Aura GELLNER. by lfuza 5? 73ZMLA1,

ATTORNEY UNITED STATES. PATENT OFFICE- 'by individual particles of color.

Patented July 6, 1937 2,086,183 APPARATUS ron srnArmo or comns ANDTHELIKE Ludwig Gellner and Anton Gellner, Berlin,

Germany Application February 14, 1935, Serial No. 6,498 1 In Germany February 23, 1934- -8 Claims. (Cl- 299-4.)

The invention relates to a spraying process, more particularly for colorsand its object is to prevent mist formation and loss of color.

Mist is formed by the air being cooled to such an extent that it is nolonger capable of retaining the water vapor dissolved in it, and causes the water vapor to separate out in the. form of The cooling of .the air during spraying outer layers of the color-air do not travel asfar as the surface being sprayed, and secondly to the fact that particles of color-rebound from the surface being sprayed.

According to the invention, this disadvantage is obviated in the following manner:

No, or practically no, atmospheric, air should be aspirated by the color-air jet issuing from the atomizing nozzle. This is secured according to the invention .by-the air surrounding the color-air jet being kept not quiescent but in 'movement in the direction of the surface being jet. Compressed air issues through the annular through the atomizer nozzle. In order that the additional air issuing from the annular nozzle, or the individual nozzles and the outer air as-. pirated by it cannot or practically cannot mix with the color-air Jet, either the outer mantle Q sprayed. For this purpose, mounted round the atomizer nozzle is either a further annular nozzle or a plurality of individual nozzles which are arranged according to-the form of the color-air nozzle or the individual nozzles in thesame way as of the atomizer. nozzle. is widened conically in the forward direction or the exit of the additional air is already effected in a direction correspending to the form of the color-air jet. Due

to this arrangement the said additional air only so far enters the spray or color-air jet, substantially without mixing therewith that it. holds the spray jet together and takes its outer portion along. In addition, this also has the effect that particles of color which rebound laterally:

from the surface being sprayed also cannot enter theair, since the additional air surrounding the are in its position by means of a nut H engaging color-air jet. and the outer air aspirated by the said additional air always impel the said particles back again onto the surface being sprayed.

Preferably, the atomizer nozzle is mounted in a receiving" nozzle widening conically in the forward direction and if desired other receiving nozzles are mounted around the first receiving nozzle, thereby securing the particular effect that the additional air and the outer air which it aspirates always flow along the inner walls of 10 the receiving nozzle, or that when working in the open, the wind does not blow away the color-. air Jet. I i

A constructional example of the invention as applied .to an ordinary color spraying pistol is shown in the accompanying drawing in which Fig. 1 a longitudinal section of the device and Fig, 2 a section along line 2-! in Fig. 1.

Referring to the drawing, A is the body of the device having a barrel shaped portion Band 9. grip-portionD. A color supply conduit c and a conduit a for compressed air lead through the grip portion-D to'the front end of the barrel portion B. The front end of the barrel portion is ,25

provided with two flanges i and it one of which, in the drawing flange i, being of smaller diameter than the other'one and arranged partly in frontof the latter. Both flanges are externally threaded at l and m respectively. The front end of the conduit '0 is conically widened, and the tapered rear and n of the body E of a color nozzle 3 fits in'tothis widened front end of the conduit C. Nozzle bo'd'yE is provided with a flange o, and a nut P is screwed on the thread 1 of flange'i and engages the flange o, the reby securing the nozzle body E to the front of the barrel portion B of the pistol, The nozzle body E has a tapering portion q with a 'number of external ribs r, and

a constricted front end a with the orifice t. 011- 4 flce t is controlled by a needle valve F which may be operated by any suitable means.

A cup-shaped member G having a conical inner surface fits on' ribs 1' of nozzle body E and is held the thread m of the flange k, and of a flange p provided on the outside of the cylindrical por- [tion u of member E. This member also su'rrounds'the front portion .9 of the color nozzle body'E at a suitable distance.

The bottom v of member- G is provided with apertures e arranged concentrical with the nozzle body E. and forming a substantially annular nozzle. ,On the front side of bottom 0, a-collar w is"- arranged, the peripheral surface of which tapers within the area confined by the annular nozzle or apertures e.

One or more conical receiving nozzles d, g and It may be attached to member G in any suitable manner, for instance by means of ribs :0, air being permitted to enter through the apertures at f, j'

and f". In operation of the'device. the color will be emitted through the center orifice t of nozzle body E, when the needle valve F is retracted. Si-

more or less definite angle of divergence- The conical surface of the projecting collar 10 is arranged substantially parallel to the outer surface of the color spray. Consequently, the compressed air Jet, which simultaneously leaves space 1/ through apertures e, is so deflected from its inside by the collar to that it forms an interiorly diverging envelope surrounding the atomized color spray, and holding it together without substantially mixing therewith. a

The receiving nozzles d. a and h, if provided, are helpful to prevent the envelope of compressed air from unduly spreading at its outside, and to keep the spray in its direction if the device is used in the open air in windy weather.

We claim: a

l. A sprayer, particularly for colors. comprising an atomizer nozzle, at least one nozzle surrounding said atomizer nozzle and being adapted to emit compressed air, and a tubular member surrounding said air-emitting nozzle; both the outer surface of said atomizer nozzle and the inner surface of said tubular member being widened conically in the direction of spraying.

2. A sprayer, particularly for colors, comprising an atomizer nozzle, at least one nozzle surrounding said atomizer nozzle and being adapted to emit compressed air, and a plurality of tubular members in staggeredarrangement inserted in,

' and distanced from, each other, the innermost tubular member surrounding said emitting nozzle; the outer surface of said atomizer nozzle and the inner surfaces of said tubular members, being widened conic'ally in the direction of spraying.

3. A sprayer, particularly for colors, comprising an atomizer nozzle, at least, one nozzle surrounding said atomizer nozzle and being adapted toremit compressed air, and a tubularmember 2,086,188 towards the bottom a and ends at the bottom surrounding said air-emitting nozzle at a distance, both the outer surface of said atomizer nozzle and the inner surface of said tubular member being widened conically in the direction of spraying, whereby the emitted compressed air may be guided along the widened surfaces and may take along atmospheric air entering into said tubular member throughthe space between said member and said air-emitting nozzle.

4. A sprayer, particularly for colors, comprising an atomizer nozzlefor producing an outwardly diverging spray, and means surrounding said atomizer nozzle for developing an interiorly' diverging envelope of air enclosing the spray from the atomizer nozzle, said surrounding means including diverging means arranged interiorly with respect to said envelope for-directing its interior in substantially parallel relation to the shape of said spray.

5. A sprayer particularly for colors comprising an atomizer nozzle adapted to emit an exteriorly .diverging spray, and means concentrically surrounding said atomizer nozzle for emitting an enveloping and diverging jet of air, said means comprising outwardly diverging surfaces arranged interiorly with respect to said let for guiding it from its interior in substantially parallel relation to the outer surface of said spray.

- zle surrounding said atomizer nozzle for emitting compressed air, and an outwardly diverging surface between said atomizer nozzle and said ring-shaped nozzle for guiding said compressed air in substantially parallel relation to the outer substantially in correspondence with the shape of the spray from the atomizer nozzle, and being arranged in the path of the air emitted from said ring-shaped nozzle.

8. A sprayer, particularly for colors, comprising an atomizer nozzle for producing an outwardly diverging spray, and a nozzle surrounding said atomizer nozzle for emitting compressed air, said surrounding nozzle including a diverg ing surface for directing the interior of the emitted air Jet substantially in correspondence with the shape of the spray from said atomizer nozzle, said diyergingsurface being arrangedat the inside with respect to said air Jet and being sub-- stantially parallel with the outside of said spray.

, LUDWIG GEILNER.

ANTON GELLNER. 

